“Mormons have more in common with historical Christianity than Islam, Hindo, Tao, Bahai”
That is meaningless. You might as well claim Satan has more in common with Gabriel than ghosts, Bigfoot and UFOs.
So what other major predecessor religion would you say Mormonism is most like, Zoroastrianism?
Remember that LDS claims to be the restored gospel of Jesus Christ and that the historical Christian churches had lost the bubble on what God wanted them to do. Their restatement of Christianity is still clearly based on Christianity vice Taoism. If you look at it from a neutral position you would have to acknowledge that at a macro level their claim of being a Christian sect/having Christian roots has some validity.